src/ZF/upair.thy

replaced {{ }} by { };

(*  Title:      ZF/upair.thy
    ID:         $Id$
    Author:     Lawrence C Paulson and Martin D Coen, CU Computer Laboratory
    Copyright   1993  University of Cambridge

Dummy theory, but holds the standard ZF simpset.
*)

upair = ZF +

setup
  TypeCheck.setup

end